Alkylation of crosslinked polymers containing N or amino or ammonium groups

US7148319B2 · kind B2 · utility

Assignee

• DSM Fine Chemicals Austria NFG GmbH & Co KG · AT

Inventors

• Michael Stanek · San Clemente, US
• Erich Steinwender · Linz, AT

Key dates

• Filing date: Nov 20, 2001
• Grant date: Dec 12, 2006
• Expiry date: Jul 18, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for alkylating cross-linked polymers containing N- or amino, ammonium or spiro-bicyclic ammonium groups. According to said method, the gelated polymers, obtained by polymerization and cross-linking, are a) optionally, deprotonated in water, an organic solvent or in a mixture of an organic solvent and water, by adding a base, b) optionally, washed once or more with water, an organic solvent or a mixture of an organic solvent and water, then c) one or more alkylators are added to the gel suspension which is stirred in water, an organic solvent or in a mixture of an organic solvent and water, at a temperature of between 5 and 160° C. at normal or increased pressure, with a base being added after a short mixing time and d) reprotonation is carried out using a mineral acid, optionally after one or more washing steps, resulting in the alkylated, cross-linked polymers containing N- or amino, ammonium or spirobicyclic ammonium groups, accordingly.